English: Kurt Gerstein (August 11, 1905 – July 25, 1945) was a German SS officer and member of the Institute for Hygiene of the Waffen-SS. He witnessed mass murders in the Nazi extermination camps Belzec and Treblinka. He contacted the Swedish diplomat Göran von Otter as well as members of the Roman Catholic Church with contacts to Pope Pius XII in order to inform the international public about the Holocaust.